Mold.



mvrrnn STATES I PATENT ornron.v

ISSAUHAR ROBBINS, OF WILKES-BARBIE, PENNSYLVANIA.

MOLD.

Specification of Letters Patent.

Patented :Aug'. 7, 1906.

Application filed January 4, 1906- Serial No 294.547.

particularly applicable to the molding of concrete building-blocks andthe like.

The principal objects of my invention are to provide a mold of thischaracter of great simplicity and of low-cost to manufacture and tooperate.

Further objects of the invention will appear below.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the fig ures.

Figure 1 is a longitudinal sectionon the line 1 1 of Fig. 2, showing oneform in which my invention may be embodied. Fig. 2 is a sectional viewon the line 2 2 of Fig. 1, and Fig. 3 is a sectional view on the line 33 of Fig. 2.

The mold proper comprises a base-plate a, which for reasons which willappear below I prefer to call a jarring-plate. On this plate is mounteda frame consisting of any convenient number of sections 1), of which Ihave illustrated four. These sections are beveled at their ends, so thatthey can be hinged together on their outsides and so that they will cometogether on their inside surfaces to form a rectangle or other shape,which is desired for the production of the particular kind of an articlethat is to be molded. It is to be noticed that they are to be hinged orpivoted together on three meeting surfaces only, and when they are movedon the pivots inwardly the other edges will come together at one cornerto form a complete rectangle or other figure. The inner surfaces of theseveral sections of this frame are preferably made vertical if thesurfaces of the molded article are to be vertical, and one or more ofthem may be provided with a rockface, as is well understood in this art.They can also be provided with core members I), projecting inwardly toproperly form the ends of the block or the like. The outer surfaces ofthe sections of this frame are shown as inclined outwardly atthebottom.It will be seen thatthis partof the mold can be em: ployed to produce amolded article ifimeans is provided for holding the frame in afixedposition and'securing it to the base or jarring plate. This means Ihaveillustratedinthe. form of an outside frame 0. This frame. is providedwith slanting inner surfaces corresponding with the slant of the outersurfaces of the frame I) and in the presentfinstance is shown asconstructed with square corners, whereby when it is forced down over theinner frame it will force the inner frame into. av

rectangular position and necessitate the location of all the partsthereof in proper relation to each other to produce. the proper-formofblocks.

hold them there.

thereon. This catch comprises. a, look (if, pivotally mounted on a boltd and'having a handle (1 The purpose of this .catch is to enable theoperator to secure the frame 0 to the base-plate a in an obvious manner.

For the purpose of reducing friction and wear on the sloping surfaces ofthe frames 1) and c I have provided one of them with a series of plates6 and the other with a series of guides or ways 0 mounted in such position as to engage and move over the surfaces of the plates 6 The guidesor ways 0 are mounted in position parallel to the direction of motion ofthe frame 0 when it is moved into operative position.

It will be obvious that this device can be used for solid or hollowarticles and when the latter are to be made cores 6 are employed. Thesecores may be of any desired shape and character, and each is providedwith a rod f, passing through it from top to bottom, the rod having aturn-buttonf on the under side thereof adapted to enter a slot 0/ in thebaseplate and to be turned thereon so as to lock the cores in a fixedposition. The other end of the rod f is provided with a handle f foroperating it, the under side of the handle presenting a bearin surface fOn the top of the core are placed a pair of plates 6 which slant inopposite directions, so as to force the rod upwardly as the handle isturned in one direction and secure the turn-button in the The frame c.therefore acts in. adouble capacityfirst, tobring the several sectionsof the frame binto proper'position: with respect to each other, and,second, to, It also has a third function this being assisted by a catch(2, mounted;

slot in:an obvious manner. I have shown the bottom of each core as beingprovided with projections e for entering slots a in the base-plate toenable the core to be easily placed in the right position.

In use, the parts being set up in an obvious manner, the operatorgrasps-the handles g of the outer frame and lifts and drops the wholemold after the molding material is introduced for the purpose of jarringthe molded material into a more compact condition, and thus improvingthe quality of the article molded. For this reason I have termed thebase-plate a jarring-plate, as it has to be made strong enough to standthe particular use to which it is put. It will be clear that the mold isremoved fromthe molded article first by loosening the cores andwithdrawing them, then by loosening the catches d and withdrawing theouter frame upwardly, and then by swinging the several parts of theinner fria'me. outwardly from the article on the basep ate.

Having thus described my invention, I claim- 1. A molding-machinecomprising a base havin extended ends, a mold-box having hinge side andend walls and resting upon the base, a frame encircling the mold-box andresting u on the base and having handles on the en s thereof, andcatches comprising levers pivoted to the ends .of the frame and havinglocks for engaging the extended ends of the base, said levers havinghandles extending above the handles of the frame.

2. A molding-machine comprising a base having extended ends, a mold-boxhaving hinged side and end walls and resting upon the base, a frameencircling the mold-box and resting on the base, and provided withhandles at the ends thereof, catches on the ends of the frame forengagin the extended ends of the base, whereby to ock the frame on themold-box, and means above the handles for releasing the catches.

3. A molding-machine, comprising a base having extended ends, a mold-boxhaving hinged side and end walls and resting upon the base, the side andend walls beinginclined upwardly and inwardly on their outer faces, aframe encircling the mold-box and resting upon the base, said framehaving its inner walls inclined upwardly and inwardly, and provided atits ends with handles, and catches comprising levers pivoted to the endsof the frame and having locks for engaging the extended ends of thebase, said levers having handles extending above the handles of theframe.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

ISSACHAR ROBBINS. Witnesses GEO. J. KULP, ELIZABETH R. KULP.

